#pragma once

#include <iostream>
#include <string>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <cstdlib> 
#include <stdlib.h> 

#define Convert(addrptr) ((struct sockaddr *)addrptr)


namespace Net_Work
{
const static int defaultsockfd = -1;
const int backlog = 5;

enum
{
    SocketError = 1,
    BindError,
    ListenError,
};



// 封装一个基类，Socket接口类
// 设计模式：模版方法类
class Socket
{
public:
    virtual ~Socket() {}
    virtual void CreateSocketOrDie() = 0;
    virtual void BindSocketOrDie(uint16_t port) = 0;
    virtual void ListenSocketOrDie(int backlog) = 0;
    virtual Socket *AcceptConnection(std::string *peerip, uint16_t *peerport) = 0;
    virtual bool ConnectServer(std::string &serverip, uint16_t serverport) = 0;
    virtual int GetSockFd() = 0;
    virtual void SetSockFd(int sockFd) = 0;
    virtual void CloseSocket() = 0;
    virtual bool Recv(std::string *buffer, int size) = 0;
    virtual bool Send(std::string &send_str) = 0;
    

public:

    //这三个会被子类继承下去
    void BuildListenSocketMethod(uint16_t port, int backlog)
    {
        CreateSocketOrDie();
        ReUseAddr();
        BindSocketOrDie(port);
        ListenSocketOrDie(backlog);
    }
    bool BuildConnectSocketMethod(std::string &serverip, uint16_t serverport)
    {
        CreateSocketOrDie();
        return ConnectServer(serverip, serverport);
    }
    void BuildNormalSocketMethod(int sockfd)
    {
        SetSockFd(sockfd);
    }
};

class TcpSocket : public Socket
{
public:
    TcpSocket(int sockfd = defaultsockfd) : _sockfd(sockfd)
    {
    }
    ~TcpSocket()
    {
    }
    void CreateSocketOrDie() override
    {
        _sockfd = ::socket(AF_INET, SOCK_STREAM, 0);//在TcpSocket类的CreateSocketOrDie方法中，
        //::的作用是指定调用全局作用域中的socket函数，而不是任何可能在当前类或命名空间中定义的名为socket的成员函数或
        if (_sockfd < 0)
            exit(SocketError);
    }
    void BindSocketOrDie(uint16_t port) override
    {
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_addr.s_addr = INADDR_ANY;
        local.sin_port = htons(port);

        int n = ::bind(_sockfd, Convert(&local), sizeof(local));
        if (n < 0)
            exit(BindError);
    }
    void ListenSocketOrDie(int backlog) override
    {
        int n = ::listen(_sockfd, backlog);
        if (n < 0)
            exit(ListenError);
    }
    Socket *AcceptConnection(std::string *peerip, uint16_t *peerport) override
    {
        struct sockaddr_in peer;
        socklen_t len = sizeof(peer);
        int newsockfd = ::accept(_sockfd, Convert(&peer), &len);
        if (newsockfd < 0) return NULL;
        *peerport = ntohs(peer.sin_port);//网络转主机序列
        *peerip = inet_ntoa(peer.sin_addr);
        Socket *s = new TcpSocket(newsockfd);
        return s;
    }
    bool ConnectServer(std::string &serverip, uint16_t serverport) override
    {
        struct sockaddr_in server;
        memset(&server, 0, sizeof(server));
        server.sin_family = AF_INET;
        server.sin_addr.s_addr = inet_addr(serverip.c_str());
        server.sin_port = htons(serverport);

        int n = ::connect(_sockfd, Convert(&server), sizeof(server));
        if (n == 0)
            return true;
        else
            return false;
    }
    int GetSockFd() override
    {
        return _sockfd;
    }
    void SetSockFd(int sockfd) override
    {
        _sockfd = sockfd;
    }
    void CloseSocket() override
    {
        if (_sockfd > defaultsockfd)
            ::close(_sockfd);
    }
    bool Recv(std::string *buffer, int size) override
    {
        char inbuffer[size];
        ssize_t n = recv(_sockfd, inbuffer, size - 1, 0);
        if (n > 0)
        {
            inbuffer[n] = 0;
            *buffer += inbuffer; // 故意拼接的
            return true;
        }
        else if (n == 0)
            return false;
        else
            return false;
    }
    bool Send(std::string &send_str) override
    {
        // 多路转接我们在统一说
        ssize_t n = send(_sockfd, send_str.c_str(), send_str.size(), 0);
        return n > 0;        
    }
    

private:
    int _sockfd;
};
}